I have table A and there is a column name COL_A.
I want that if someone change the value, lets say from 1 to 'X' (not costant) that the trigger will change it back from 'X' to 1.
SQLite does not support changing the new column values.
The only way to change a column in a trigger would be to run an UPDATE command,
but that would run the trigger again.
What you can do is to prevent changing the column in the first place:
CREATE TRIGGER IF NOT EXISTS prevent_col_a_change
BEFORE UPDATE OF col_a ON a
BEGIN
SELECT RAISE(ABORT, 'COL_A must not be changed');
END;
UPDATE trigger is a good solution for your case. Just set old value to the new value, that will lead to behaviour you want.
For example:
CREATE OR REPLACE TRIGGER orders_before_update
BEFORE UPDATE
ON orders
FOR EACH ROW
BEGIN
:new.CreatedAt:= :old.CreatedAt;
END;
Related
I am trying to make an upsert trigger on ORACLE via PL/SQL by checking some examples, i am doing fine, i think it is the last step i should only configure. My requirement is that :
A system that will insert to that field will remain one column always null, so i will read column value from another table, then upsert it with inclusion of that value.
d2c_region_locale_config holds d2c_is_active value, so i firstly read that value regarding to locale condition then trigger inserts or updates to table with addition of this value on active_for_d2c column.(for update i am using locale and country columns as it is shown on where clause, they are not PK but has not null condition)
So i've created this trigger:
CREATE OR REPLACE TRIGGER BL_PIM_LOCALE_COUNTRY
BEFORE INSERT OR UPDATE ON PIM_LOCALE_COUNTRY REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
DECLARE
l_active_for_d2c INTEGER;
BEGIN
if :NEW.active_for_d2c is null then
DELETE from pim_locale_country where active_for_d2c is null;
select distinct(d2c_isactive) into l_active_for_d2c from d2c_region_locale_config where d2c_locale= :NEW.locale;
UPDATE pim_locale_country
SET locale = :NEW.locale, locale_name = :NEW.locale_name,
country = :NEW.country, country_name = :NEW.country_name, isdummy = :NEW.isdummy,
active_for_d2c = l_active_for_d2c, itextpos = :NEW.itextpos, locale_charset = :NEW.locale_charset,
fallback_locale = :NEW.fallback_locale, default_for_lang = :NEW.default_for_lang, opeclang = :NEW.opeclang
where locale = :NEW.locale and country = :NEW.country;
IF ( sql%notfound ) THEN
INSERT INTO PIM_LOCALE_COUNTRY (locale,locale_name,country,country_name,isdummy,active_for_d2c,itextpos,locale_charset,fallback_locale,default_for_lang,opeclang)
VALUES (:NEW.locale, :NEW.locale_name,:NEW.country,:NEW.country_name,:NEW.isdummy,l_active_for_d2c,:NEW.itextpos,:NEW.locale_charset,:NEW.fallback_locale,:NEW.default_for_lang,:NEW.opeclang);
END IF;
end if;
END;
It currently does the job, reads value and inserts or updates the existing locale-country couple for other values. But critical thing is that, table always has one "null" value(Please check screenshot), even that i run delete statement at the beginning on my trigger. So my question would be how to delete, or how to make this approach on trigger side ?
Many thanks for answers!
Trigger before insert doesn't block insert itself, so you insert that record twice. That is, once your trigger done its work (inserted or updated record), oracle will proceed with insert (or update) using values that stand in NEW record of your trigger. If trigger modifies NEW., it will be stored as you changed it, but if trigger inserts something itself, you can get more records.
You can use instead of insert or update triggers, and then oracle will not run its own inserts/updates after trigger finishes.
But more common way for 1-record triggers is to modify fields in NEW, for this case field NEW.d2c_is_active.
It looks like this (possible typos, please check)
CREATE OR REPLACE TRIGGER BL_PIM_LOCALE_COUNTRY
BEFORE INSERT OR UPDATE ON PIM_LOCALE_COUNTRY REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
BEGIN
if :NEW.active_for_d2c is null then
select d2c_isactive
into :NEW.active_for_d2c
from d2c_region_locale_config
where d2c_locale= :NEW.locale and rownum<=1;
end if;
END;
I am trying to write a Trigger which basically updates one table when an entry is made on another table.
CREATE OR REPLACE TRIGGER "DTISCDB_OWNER"."REQUEST_CONTEXT_TR"
AFTER INSERT OR UPDATE ON REQUEST_CONTEXT
FOR EACH ROW
BEGIN
:NEW.REQUEST_DATETIME := SYSDATE;
:NEW.ID := TRUNC(DBMS_RANDOM.VALUE(100000000000000000000000000000000000,999999999999999999999999999999999999));
SELECT bre_conditions_seq.NEXTVAL INTO :OLD.seq_number FROM dual;
SELECT REQUEST_CONTEXT.CURRENT_STATE INTO :NEW.STATE FROM REQUEST_CONTEXT;
SELECT REQUEST_CONTEXT.REQUEST_ID INTO :NEW.REQUEST_ID FROM REQUEST_CONTEXT;
INSERT INTO REQUEST_LIFECYCLES(ID,SEQ_NUMBER,STATE,REQUEST_ID,REQUEST_DATETIME)
VALUES(:NEW.ID,:NEW.seq_number,:NEW.STATE,:NEW.REQUEST_ID,:NEW.REQUEST_DATETIME);
END;
You seem to be confused about what the correlation pseudorows are for and what they hold and can do. It looks like you're treating :NEW as if it is related to the REQUEST_LIFECYCLES table you are inserting into inside the trigger, and :OLD as if it is related to the REQUEST_CONTEXT row that has been inserted or updated and caused the trigger to fire.
Both OLD and NEW refer to the table the trigger is against, REQUEST_CONTEXT. If the trigger was fired by an update then OLD has the pre-update values for the affected row; if it was fired by an insert then it is empty as there is no old state. Either way NEW has the current state, with the newly-inserted or post-update values. You can't change the OLD values, and it doesn't make sense to change the NEW values in an 'after' trigger. You also don't need to query the table the trigger is fired against, as the NEW pseudorow already makes that information available.
So if you are trying to use the inserted/updated values in REQUEST_CONTEXT to create a row in REQUEST_LIFECYCLES, you would do something like:
CREATE OR REPLACE TRIGGER "DTISCDB_OWNER"."REQUEST_CONTEXT_TR"
AFTER INSERT OR UPDATE ON REQUEST_CONTEXT
FOR EACH ROW
BEGIN
INSERT INTO REQUEST_LIFECYCLES(ID, SEQ_NUMBER, STATE, REQUEST_ID,
REQUEST_DATETIME)
VALUES(TRUNC(DBMS_RANDOM.VALUE(100000000000000000000000000000000000, 999999999999999999999999999999999999)),
bre_conditions_seq.NEXTVAL, :NEW.CURRENT_STATE, :NEW.REQUEST_ID,SYSDATE);
END;
/
I'm assuming you wanted to set the 'lifecycle' SEQ_NUMBER value from the trigger, despite you trying to set the :OLD value - hopefully the old reference was a mistake. If you were trying to set that value in both REQUEST_CONTEXT and REQUEST_LIFECYCLES you would need a before insert/update trigger instead, and would set :NEW.SEQ_NUMBER rather than the :OLD value, before using it in the values clause.
As Justin said using a random value for the ID is rather strange, not least because it won't be unique, and a sequence is much more common. You may actually want the ID from the inserted/updated row, in which case you can just refer to :NEW.ID in the values clause instead of generating a new value. (It's also possible you are trying to set that ID in both REQUEST_CONTEXT and REQUEST_LIFECYCLES too, but that would be even stranger, and you'd need a before-insert/update trigger to do that anyway).
I'm developing a small library database and I don't want to allow someone to update someone's ID. But I need to use AFTER UPDATE and FOR EACH STATEMENT (which I'm told is Oracle's default). So, basically, if someone updates the customer info and alter his/her ID or mistypes it, the trigger will automatically update it again to the old value. The problem is that Oracle won't let me use :NEW and :OLD when using FOR EACH STATEMENT. Are there any workarounds to this issue?
CREATE OR REPLACE TRIGGER alter_id_trigger
AFTER UPDATE ON CUSTOMER
BEGIN
UPDATE CUSTOMER SET ID = :OLD.ID
WHERE ID = :NEW.ID;
END;
Thank you!
Use the below code for trigger.
Changes done:
Using BEFORE UPDATE instead of AFTER UPDATE.
Setting the value of ID to what it was previously. (The ID Field would never be modified)
CREATE OR REPLACE TRIGGER ALTER_ID_TRIGGER
BEFORE UPDATE ON CUSTOMER
BEGIN
SET :NEW.ID = :OLD.ID
END;
Note: With BEFORE UPDATE:
You can not create a BEFORE trigger on a view.
You can update the :NEW values.
You can not update the :OLD values.
I think you want a before update trigger:
CREATE OR REPLACE TRIGGER alter_id_trigger
BEFORE UPDATE ON CUSTOMER
BEGIN
SET :NEW.ID = :OLD.ID
END;
You could test to see if the value is being changed, but that seems unnecessary.
CREATE OR REPLACE TRIGGER Net_winnings_trigger
AFTER UPDATE OF total_winnings ON Players
FOR EACH ROW
DECLARE
OldTuple OLD
NewTuple NEW
BEGIN
IF(OldTuple.total_winnings > NewTuple.total_winnings)
THEN
UPDATE Players
SET total_winnings = OldTuple.total_winnings
WHERE player_no = NewTuple.player_no;
END IF;
END;
/
I am trying to get a trigger that will only allow the 'total_winnings' field to be updated to a value greater than the current value.
If an update to a smaller value occurs, the trigger should just leave the set the value to the old value (as if the update never occured)
Since you want to override the value that is specified in the UPDATE statement, you'd need to use a BEFORE UPDATE trigger. Something like this
CREATE OR REPLACE TRIGGER Net_winnings_trigger
BEFORE UPDATE OF total_winnings ON Players
FOR EACH ROW
BEGIN
IF(:old.total_winnings > :new.total_winnings)
THEN
:new.total_winnings := :old.total_winnings;
END IF;
END;
But overriding the value specified in an UPDATE statement is a dangerous game. If this is something that shouldn't happen, you really ought to raise an error so that the application can be made aware that there was a problem. Otherwise, you're creating all sorts of potential for the application to make incorrect decisions down the line.
Something like this should work.. although it will be hiding the fact that an update is not taking place if you try to update to a smaller value. To the user, everything will look like it worked but the data will remain unchanged.
CREATE OR REPLACE TRIGGER Net_winnings_trigger
BEFORE UPDATE OF total_winnings
ON Players
FOR EACH ROW
DECLARE
BEGIN
:new.total_winnings := greatest(:old.total_winnings,:new.total_winnings);
END;
i have two tables
Order(id, date, note)
and
Delivery(Id, Note, Date)
I want to create a trigger that updates the date in Delivery when the date is updated in Order.
I was thinking to do something like
CREATE OR REPLACE TRIGGER your_trigger_name
BEFORE UPDATE
ON Order
DECLARE
BEGIN
UPDATE Delivery set date = ??? where id = ???
END;
How do I get the date and row id?
thanks
How do i get the date and row id?
Assuming these are columns on your ORDER table called DELIVERY_DATE and ID your trigger should look something like this:
CREATE OR REPLACE TRIGGER your_trigger_name
BEFORE UPDATE ON Order
FOR EACH ROW
BEGIN
if :new.delivery_date != :old.delivery_date
then
UPDATE Delivery d
set d.delivery_date = :new.delivery_date
where d.order_id = :new.id;
end if;
END;
Note the FOR EACH ROW clause: that is necessary to reference values from individual rows. I have used an IF construct to test whether to execute the UPDATE on Delivery. If you have no other logic in your trigger you could write it like this...
CREATE OR REPLACE TRIGGER your_trigger_name
BEFORE UPDATE OF delivery_date ON Order
FOR EACH ROW
BEGIN
UPDATE Delivery d
set d.delivery_date = :new.delivery_date
where d.order_id = :new.id;
END;
I have answered the question you asked but, as an aside, I will point out that your data model is sub-optimal. A properly normalized design would hold DELIVERY_DATE on only one table: DELIVERY seems teh logical place for it.
Use the OLD and NEW bind variables. OLD references the row or column being updated before the change is made; NEW references it after the change.
CREATE OR REPLACE TRIGGER trig1
BEFORE UPDATE
ON order REFERENCING NEW AS new
FOR EACH ROW
BEGIN
UPDATE delivery
SET ddate = :new.ddate
WHERE id = :new.id;
END;
You can modify the REFERENCING clause to give your bind variables different names. You can include OLD as <name> too. Example:
CREATE OR REPLACE TRIGGER trig1
BEFORE UPDATE
ON order REFERENCING OLD AS old_values NEW AS new_values
...
If you don't want to change the default names of "old" and "new", you can leave out the REFERENCING clause completely.
There is an implicit new and old reference in the trigger in the form of:
REFERENCING OLD AS OLD NEW AS NEW
You can write to the :NEW value but not to the :OLD value.
UPDATE Delivery set date = :new.delivery_date where id = :new.id;
CREATE OR REPLACE TRIGGER "BUR_TABLENAME" BEFORE
UPDATE ON "TABLE" FOR EACH ROW
BEGIN
If :new.active_date is not null Then
:new.active_date := TRUNC(:new.active_date);
End If;
END;
Template:
CREATE OR REPLACE TRIGGER TRIGGER_NAME
BEFORE
UPDATE
ON TABLE_NAME
REFERENCING OLD AS OLD NEW AS NEW
FOR EACH ROW
DECLARE
V_VARIABLE NUMBER (1);
BEGIN
//Do Stuff;
null;
end;
Whenever there is a need for this kind of trigger, have a good look at your design. Is there really a need for a separate delivery record? Does an order really have more than 1 delivery ?
Triggers seem nice but they do tend to mess things up pretty quickly.